參數(shù)資料
型號(hào)： MAX1790
廠(chǎng)商： Maxim Integrated Products, Inc.
元件分類(lèi)： DC/DC變換器
英文描述： Low-Noise Step-Up DC-DC Converter(低噪聲步升DC-DC轉(zhuǎn)換器)
中文描述： 低噪聲、升壓型DC-DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 3/12頁(yè)
文件大?。?/td> 405K
代理商： MAX1790
M
Low-Noise Step-Up DC-DC Converter
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS
(V
IN
=
SHDN
= 3V, FREQ = GND,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
Input Supply Range
V
IN
Note 1:
Current limit varies with duty cycle due to slope compensation. See the
Output Current Capability
section.
Note 2:
Specifications to -40°C are guaranteed by design and not production tested.
MIN
2.6
TYP
MAX
5.5
UNITS
V
Feedback Voltage
FB Input Bias Current
V
FB
I
FB
1.215
1.26
40
V
Shutdown Supply Current
ERROR AMPLIFIER
I
IN
10
μA
4
5
nA
Feedback-Voltage Line
Regulation
0.15
%/V
Transconductance
OSCILLATOR
g
m
70
260
μmhos
V
IN
Undervoltage Lockout
UVLO
2.25
2.52
V
Quiescent Current
I
IN
0.2
0.35
mA
Frequency
f
OSC
490
900
78
770
1500
92
kHz
Maximum Duty Cycle
N-CHANNEL SWITCH
DC
%
Current Limit
On-Resistance
Current-Sense Transresistance
CONTROL INPUTS
I
LIM
R
ON
R
CS
1.2
2.3
0.5
0.65
A
0.3
V/A
Input Low Voltage
Input High Voltage
V
IL
V
IH
0.3
·
V
IN
V
V
0.7
·
V
IN
CONDITIONS
FREQ = GND
FREQ = IN
FREQ = GND
Level to produce V
COMP
= 1.24V
V
FB
= 1.24V
Level to produce V
COMP
= 1.24V,
2.6V < V
IN
< 5.5V
I = 5μA
SHDN
= GND
V
FB
= 1.0V, switching
V
FB
= 1V, duty cycle = 65%
I
LX
= 1.2A
V
IN
rising, typical hysteresis is 40mV,
LX remains off below this level
SHDN
, FREQ, V
IN
= 2.6V to 5.5V
SHDN
, FREQ, V
IN
= 2.6V to 5.5V
V
FB
= 1.3V, not switching
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